Port Washington, Wisconsin · field elev 754 ft
Density Altitude at Port Washington/Didier Field (35W)
Port Washington/Didier Field sits at 754 ft, and even a typical July afternoon (80 °F) only lifts density altitude to about 2,258 ft — heat still trims performance, but the field rarely turns high-and-hot.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 19.1 | −1,794 ft | 27.1 | −1,222 ft |
| February | 22.0 | −1,585 ft | 30.7 | −968 ft |
| March | 31.6 | −905 ft | 39.8 | −337 ft |
| April | 42.5 | −153 ft | 51.6 | 460 ft |
| May | 53.4 | 580 ft | 63.2 | 1,222 ft |
| June | 63.7 | 1,255 ft | 74.0 | 1,913 ft |
| July | 69.5 | 1,627 ft | 79.5 | 2,258 ft |
| August | 68.2 | 1,544 ft | 78.0 | 2,165 ft |
| September | 60.8 | 1,066 ft | 71.4 | 1,748 ft |
| October | 48.9 | 280 ft | 58.4 | 910 ft |
| November | 36.2 | −585 ft | 44.3 | −30 ft |
| December | 25.2 | −1,356 ft | 32.6 | −835 ft |
▲ above 5,000 ft · ⚠ above 8,000 ft. These are planning references at standard pressure and dry air — afternoon humidity and low pressure both push the real number higher. Run today's values below.
Run today’s numbers for 35W
DENSITY ALTITUDE
Field elevation 754 ft — the air behaves like 2,290 ft.
- PRESSURE ALT
- 755 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
- —
- AIR DENSITY
- —
- WATER · GRAINS/LB
- —
For training and reference · verify with official sources and your POH before flight · no tool on this site renders a go / no-go judgment
Nearby Wisconsin fields
- KETB — West Bend Municipal
West Bend · elev 888 ft
- KSBM — Sheboygan County Meml International
Sheboygan · elev 755 ft
- KMWC — Lawrence J Timmerman
Milwaukee · elev 745 ft
- KHXF — Hartford Municipal
Hartford · elev 1,070 ft
- 02C — Capitol Drive
Brookfield · elev 844 ft
- KUES — Waukesha County
Waukesha · elev 912 ft
- KMKE — General Mitchell International
Milwaukee · elev 728 ft
- 8D1 — New Holstein Municipal
New Holstein · elev 992 ft
Frequently asked questions
How high does density altitude get at 35W in summer?
On a typical July afternoon — around 80 °F at the nearest NOAA normals station — density altitude at Port Washington/Didier Field reaches roughly 2,258 ft at standard pressure. Hotter-than-normal days, low pressure, and humidity all push it higher, so run the day's actual numbers before flying.
What is the density altitude at 35W on an average day?
It swings with the seasons: from roughly −1,794 ft at the coldest month's average temperature to about 1,627 ft at the warmest month's — all from a constant field elevation of 754 ft. The month-by-month table above carries the full year.
What is the field elevation of Port Washington/Didier Field?
754 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 35W (FAA), in Port Washington, Wisconsin.